NAME

exp, log, log10, pow − exponential, logarithm, power

SYNOPSIS

#include <math.h>

double exp(double x);

double log(double x);

double log10(double x);

double pow(double x, double y);

DESCRIPTION

exp() returns the exponential function e∗∗x.

log() returns the natural logarithm of x.

log10() return the logarithm to base 10. 

pow() returns x∗∗y. pow(0.0,0.0) is 0.0 in conformance with SVID. 

SEE ALSO

matherr(3M)

DIAGNOSTICS

All these functions handle exceptional arguments in conformance with the i System V Interface Definition (SVID).  Thus for x == ±0, log(x) is −HUGE (HUGE = ∞) with a division by zero exception; for x < 0, log(x) is −HUGE with an invalid operation exception; for x == +∞ or a quiet NaN, log(x) is x without exception; for x a signaling NaN, log(x) is a quiet NaN with an invalid operation exception; for x == 1, log(x) is 0 without exception; for any other positive x, log(x) is a normalized number with an inexact exception. 

In addition, exp(), log(), log10() and pow() may also set errno and call matherr(3M). 

SunOS 5.1  —  Last change: 30 Apr 1992